回答編集履歴
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追記
test
CHANGED
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@@ -7,3 +7,45 @@
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tolower(ch) - 'a' がcounterの範囲: 0～25 の下限/上限から外れることがある から。
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[追記] 別解(のひとつ)
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```C++
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#include <iostream>
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#include <string>
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#include <map>
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#include <cctype>
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25
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int main() {
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std::map<char,int> counter;
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char ch;
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while ( std::cin >> ch ) {
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if ( isalpha(ch) ) ++counter[tolower(ch)];
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}
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for ( ch = 'a'; ch <= 'z'; ++ch ) {
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std::cout << ch << " : " << counter[ch] << std::endl;
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}
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}
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```
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